Display screen or portion thereof with transitional graphical user interface



FIG. 1 is the first image in a sequence for a display screen or portionthereof with transitional graphical user interface showing our newdesign;

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof;

FIG. 4 is the fourth image thereof;

FIG. 5 is the fifth image thereof;

FIG. 6 is the sixth image thereof;

FIG. 7 is the seventh image thereof;

FIG. 8 is the eighth image thereof;

FIG. 9 is the ninth image thereof;

FIG. 10 is an enlarged view of the first image thereof with the featuresshown in broken lines removed;

FIG. 11 is an enlarged view of the second image thereof with thefeatures shown in broken lines removed;

FIG. 12 is an enlarged view of the third image thereof with the featuresshown in broken lines removed;

FIG. 13 is an enlarged view of the fourth image thereof with thefeatures shown in broken lines removed;

FIG. 14 is an enlarged view of the fifth image thereof with the featuresshown in broken lines removed;

FIG. 15 is an enlarged view of the sixth image thereof with the featuresshown in broken lines removed;

FIG. 16 is an enlarged view of the seventh image thereof with thefeatures shown in broken lines removed;

FIG. 17 is an enlarged view of the eighth image thereof with thefeatures shown in broken lines removed; and,

FIG. 18 is an enlarged view of the ninth image thereof with the featuresshown in broken lines removed.

The outermost broken lines showing the display screen or portion thereofform no part of the claimed design.

The remaining broken lines in the figures depict portions of thetransitional graphical user interface which form no part of the claimeddesign.

The appearance of the transitional graphical user interface sequentiallytransitions between the images shown in FIGS. 1-9 and in FIGS. 10-18,respectively. The process or period in which one image transitions toanother forms no part of the claimed design.

CLAIM We claim the ornamental design for a display screen or portionthereof with transitional graphical user interface, as shown anddescribed.